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Slide 1

Ex) Find the common multiples of 3 and 4.

Sol) Multiples of 3 = 3,6,9,12,15,18,21,24,27,30,33

Multiples of 4 = 4,8,12,16,20,24,28,32,36

Common multiples of 3 and 4 are

Slide 2

Ex) Find the common factors of 12 and 18.

Sol) Factors of 12 = 1,2,3,4,6, and 12

Factors of 18 = 1,2,3,6,9, and 18.

Slide 3

Two numbers are said to be co-prime, If they do not have any common factors other than 1

(It is not necessary to be either of them to be prime numbers.

That is either one or both may be composite numbers)

Slide 4

A number is divisible by both 2 and 3.

By what other numbers will that number be divisible ?

Slide 5

A number is divisible by 15.

By what other numbers will that number be always divisible ?

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